<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise API - resolve</title>
</head>
<body>
    <script>
        //
        let p1 = Promise.resolve(521);
        //如果传入的参数为 非Promise类型的对象, 则返回的结果为成功promise对象
        //如果传入的参数为 Promise 对象, 则参数的结果决定了 resolve 的结果
        let p2 = Promise.resolve(new Promise((resolve, reject) => {
             //resolve('OK');
            reject('Error');
        }));
        console.log(p2);
        var a = p2.catch(reason => {
            console.log("reason", reason);
        }).then(value=> {
            console.log('value => ', value) ;
            
        })

        console.log(a) ;
        
    </script>
</body>
</html>